Living with a stink? Technology might help

Communities worldwide are deploying advanced plant-based odour control systems to tackle industrial smells.

Milpitas, California, in Silicon Valley's tech hub, has endured decades of rank smells from a 342-acre landfill and other industrial sites. Even after recent improvements, residents still face two to three hours of bad odours daily. Landfill operators, ordered by local authorities, now use drones, real-time monitors, and automated gas-collection systems to track and measure the chemicals responsible.

This shift toward technology reflects a global trend: as urban areas expand closer to waste, water, and manufacturing facilities, communities are raising alarms about persistent smells. Many regions lack clear regulations for managing environmental odours, fueling demand for proven, cost-effective solutions.

How plant-based technology works

Modern odour control relies on plant-derived formulations that neutralise malodours at the molecular level through multiple mechanisms:

Adsorption — malodour molecules attach to atomised droplets via electrostatic attraction

Absorption — gases dissolve into the liquid phase of droplets

Solubility enhancement — formulations increase aqueous solubility of poorly-soluble compounds

Chemical reaction — essential-oil components react with malodorous compounds, producing odour-free products

These water-based solutions effectively target hydrogen sulfide, ammonia, sulfur dioxide, mercaptans, amines, styrene, and other industrial compounds — all without synthetic fragrances, toxic chemicals, or hazardous VOCs.

Systems are deployed via fogging, misting, spraying, or vapor-phase dispersion, tailored to site conditions and malodour levels. Unlike masking agents that simply cover unpleasant smells, these formulations absorb and convert malodours into non-volatile products.

Real-time monitoring puts an end to finger-pointing

In Des Moines, Iowa, residents have long complained of the "Eastside Funk." Authorities now spend around $240,000 annually on technology to track the stink — deploying rings of electronic noses and weather stations to provide real-time data on chemical concentrations and wind patterns. The system has ended disputes about which facility is to blame when complaints arise.

Similar technology supports regulatory compliance everywhere: real-time sensors quantify odour intensity and character, replacing manual log sheets with precise data. Dispersion modeling and wind analysis trace odour origins, enabling targeted mitigation measures. Case studies show integrated approaches — combining monitoring with targeted application of plant-based neutralisers — can cut community complaints by up to 70% within six months.

Moving beyond simple masking

Many operators still opt for cheaper solutions: spraying industrial-scale deodorisers to mask odours from landfills and sewage processing. Experts are increasingly sceptical of these approaches, likening them to fabric conditioner that covers one smell with another.

Plant-based neutralisers take a different path. Through chemical reaction and absorption, they eliminate odours at their source. These formulations also address dust and particulates — often carriers of odour — through polymer-based soil binders that form cross-linked matrices binding loose materials.

A problem without borders

As housing developments move closer to livestock farms, composting sites, food processing plants, and mining operations, odour management becomes a critical operational concern. In Western Sydney, for example, wastewater treatment plants might deploy fogging systems to neutralise ammonia and hydrogen sulfide emissions, while adding concentrated neutralisers to malodorous process liquids to eliminate residual smells.

The challenge remains subjective: "Unfortunately, the general rule is that the nastier we perceive the odour to be, the more sensitive towards it we are," explains Johan Lundström of the Karolinska Institute. But with plant-based solutions backed by real-time monitoring and compliance data, communities and industry are turning environmental odours — once a matter of guesswork and finger-pointing — into an increasingly precise science.